Foamy Power Steering - Solved!!

[juddster]

I'll post the solution here instead of lower down in a new post. Hopefully this will aid someone else from repeating my mistake.

The problem ended up being bad seals at the ports on PS rack. I first used just an oring with the straight threaded fittings. Then tried the sealing washers by themselves. Then I thought they needed to be used together and this was confirmed by Jeff Kleiner. That worked!

Place the sealing washer on the fitting first, then the oring then thread the fitting into the port and just snug tight. The oring will seat against the chamfered portion on the port.



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There have been some posts previously, but looking to get a little help with foaming power steering on my MKIV.

Here is my set up:
- Coyote Gen 2
- Older style PS that uses the triangular bracket w/idler, the AC mounts to hold the pump, and a remote reservoir.
- '87-'93 Mustang Rack
- AN fittings and hoses

I have done the bleed as directed without the engine running, plus extra. I think I have gone lock to lock over 30 times during the process. But as soon as I get the engine going and turn the wheel the pin hole at the reservoir becomes a geyser and the fluid is all foamy (and extremely messy!). Or after the engine runs for ~20-30 seconds it starts shooting out due to the foaming. Reservoir is about half full.

I have noticed when going lock to lock w/o the engine running that there are large air bubbles (very little foaming) coming from the return line from the rack. I can see the large bubbles entering the reservoir. This continues no matter how much I bleed the system. Which, I assume is where the problem lies. No matter how much I go lock to lock the large air bubbles persist.

I would appreciate any input to help with this. My next step is go kart stage and this foaming is driving me nuts.

Thanks in advance!!